<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*div{
            width:200px;
            height:200px;
            border:1px solid red;
            border-top:2px dashed yellow;
            border-bottom:2px dotted green;
            border-left:2px solid blue;
            border-right:2px solid pink;
        }*/

        input{
            /*outline-style:none;*/      /*去掉表单控件轮廓线*/
            border:0 none;     /*去掉边框线*/
        }
    </style>
</head>
<body>
   <div>
   </div>

   <input type="text">
</body>
</html>